Evaluate: $\large \int \frac {1 + \tan^2 x} {\sqrt (1 - \tan^2 x)}\;$$dx$

Question

$\begin{array}{1 1}(A) \sin^{-1} (\tan x) + k \\ (B) \cos^{-1} (\tan x) + k \\ (C) \sin^{-1} (\cot x) + k \\ (D) \cos^{-1} (\sec x) + k \end{array}$